Writing instrument



FIG. 1 is an isometric view of the present invention;

FIG. 2 is a left side view of the present invention;

FIG. 3 is a right side view of the present invention;

FIG. 4 is a front view of the present invention;

FIG. 5 is a rear view of the present invention;

FIG. 6 is a top view of the present invention; and,

FIG. 7 is a bottom view of the present invention.

The broken lines in the drawings are included for the purpose of illustrating the portion of the writing instrument that forms no part of the claimed design. 

The ornamental design for a writing instrument, as shown and described. 